Manganese-(II) salts of phosphonic acid half-esters, polyamide stabilizers

ABSTRACT

New manganese-(II) salts of phosphonic acid half-esters are used as stabilisers for polyamides. The new compounds are manufactured from the corresponding sodium salts of the phosphonic acid halfesters and a manganese-(II) salt.

United States Patent Rody et al.

MANGANESE-(IDSALTS OF PHOSPHONIC ACID HALF-ESTERS, POLYAMIDE STABILIZERS lnventors: Jean Rody, Basel; Paul Moser,

Riehen, both of Switzerland Assignee: Ciba-Geigy Corporation, Ardsley,

Filed: Feb. 7, 1974 Appl. No: 440,635

Related US. Application Data Division of Ser. No. 282,636, Aug. 21, 1972, Pat. No. 3,839,380.

Foreign Application Priority Data Sept. 30, 1971 Switzerland 14210/71 US. Cl 260/45.75 R Int. Cl. C08g 51/62 Field of Search 260/45.75 R, 78

Primary Examiner-V. P. Hoke Attorney, Agent, or FirmCharles W. Vanecek; Nestor W. Shust [5 7] ABSTRACT New manganese-(ll) salts of phosphonic acid halfesters are used as stabilisers for polyamides. The new compounds are manufactured from the corresponding sodium salts of the phosphonic acid half-esters and a manganese-(ll) salt.

16 Claims, No Drawings MANGANESE-(11) SALTS OF PHOSPHONIC ACID HALF-ESTERS, POLYAMIDE STABILIZERS This application is a divisional application of U.S. Application Ser. No. 282,636, filed on Aug. 21, 1972, now U.S. Pat. No. 3,839,380.

The subject of the invention are new manganese-(ll) salts of phosphonic acid half-esters, their manufacture, their use for protecting polyamides and, as an industrial product, the organic material protected, with the aid of these salts, against the harmful influence of light.

It is known to employ manganese salts as light stabilisers for polyamides, especially for polyamides delustred with titanium dioxide. The salts concerned are the salts of the divalent manganese cation with anions of organic acids, for example acetate, oxalate, lactate and benzoate. They are added to the carrier material together with acids of phosphorus, either in the form of the corresponding sodium salts or as free acids or as their esters, such as sodium hexametaphosphate, phosphorous acid, phenylphosphonic acid or esters thereof, before, during or after the polymerisation or polycondensation. However, these light-stabilised mixtures suffer from the disadvantage that they can partially be eluted by aqueous media, which manifests itself in a decrease in the light protection action above all after dyeing thin polymer structures, for example fibres, in aqueous liquors. The same disadvantage is also shown by phosphorus-free polyamide fibres stabilised with manganese salts of organic acids, such as manganese acetate, alone.

It has now been found, surprisingly, that new compounds of the formula 1 O x y in which R denotes alkyl with l to 18 carbon atoms, cyclohexyl, aryl with 6 to 10 carbon atoms which is unsubstituted or substituted by 1 or 2 methyl groups or aralkyl with 7 to 11 carbon atoms, A denotes the anion of an aliphatic carboxylic acid with l to 18 carbon atoms or of an aromatic carboxylic acid with 7 to l 1 carbon atoms or the chloride, bromide or iodide anion, x denotes 1 or 2, y denotes 0 or 1, with x +y being 2, and R denotes alkyl with 1 to 18 carbon atoms, are very good light stabilisers for polyamides.

As compared to the previously known manganese salts or their mixtures with phosphorus compounds, the compounds according to the invention show a distinctly improved action as light stabilisers and furthermore have the industrially desired advantage of a substantially lower ease of elution from the polyamide by aqueous media. As compared to other previously known light protection agents for polyamides from the series of the salts or complexes of hydroxybenzylphosphonic acid half-esters with various other metal ions, the compounds according to the invention show a far better light protection action and substantially more favourable colour properties,

R and R in the formula I denote, for example, methyl, ethyl, n-propyl, iso-propyl, butyl, pentyl, hexyl, octyl, iso-octyl, decyl, dodecyl, tetradecyl or octadecyl.

R is preferably alkyl with 1 to 12 carbon atoms and particularly preferably alkyl with2 to 12 and with 3 to 12 carbon atoms.

R is preferably alkyl with 2-18 carbon atoms such as methyl, ethyl, propyl, butyl or octyl. Methyl, ethyl or butyl are particularly preferred.

Aryl in the formula 1 denotes, for example, phenyl or naphthyl and aralkyl can denote benzyl, 2-phenylethyl or naphthylmethyl.

The anion A in the formula T can be the anion of an aliphatic carboxylic acid with l to 18 carbon atoms, for example the anion of formic acid, acetic acid, propionic acid, butyric acid, 2-ethyl-hexanoic acid, lauric acid and stearic acid.

The anion A can, however, also be the anion of an aromatic carboxylic acid with 7 to 1 1 carbon atoms, for example the anion of benzoic acid, of a toluic acid, of phenylacetic acid or of butylbenzoic acid.

Anions of aliphatic carboxylic acids with 2 to 8 carbon atoms, for example the acetate ion, or anions of aromatic carboxylic acids with 7 or 8 carbon atoms, for example the benzoate ion, are preferred as A.

Possible carrier materials for the new compounds are polyamides and copolyamides which are obtained by polymerisation of diamines and dicarboxylic acids and- /or of aminocarboxylic acids or the corresponding lactams. The substrates can be in the form of filaments, bristles, films, injection-moulded articles and the like.

The compounds of the formula 1 are added to the carrier materials in an amount which corresponds to 1.0 to 500 ppm of manganese, relative to the carrier material. Manganese additions of 10 to 200 ppm relative to the carrier material are preferred, and those of 10 to ppm are particularly preferred.

The new compounds can be incorporated into the polyamides before, during or after polycondensation, optionally conjointly with further additives. Possible further additives are: pigments, maninly titanium dioxide in its two modifications rutile and anatase, in concentrations of 0.0l-3.0%, but also coloured pigments such as cadmium sulphides, phthalocyanines, and perylene pigments; chain regulators, for example acetic acid and benzoic acid; phenolic anti-oxidants or amine antioxidants such as l,3,5-trimethyl-2,4,6-tri-(3,5-ditert.-butyl-4-hydroxy-benzy1)-benzene, pentaerythritol-[ 3-( 4-hydroxy-3 ,S-di-tert.-butylphenyl)-propionic acid]-tetraester, l,6-hexamethylene-[ 3-( 4-hydroxy- 3,S-ditert-butylphenyl)-propionic acid]-diamide, 4,4- butylidenebis(3-methyl-6-tert.butylphenol) and ditert.- octyldiphenylamine; UV-absorbers which are preferably incorporated into the polymer after the polycondensation, for example 2-(2-hydroxy-3,5-di-tert.- amyl-phenyl)-benzotriazole and 2-(2-hydroxy-5'-methyl-phenyl)-benzotriazole; further additives, such as antistatic agents and flameproofing agents.

The new compounds can also be added to the finished polyamide before or during shaping, for example by sprinkling (dry blending) onto dried granules or by applying a solution of the compounds according to the invention, and optionally further additives, to the polyamide and subsequently evaporating the solvent.

Various processes are suitable for the manufacture of the compounds of the formula 1. Thus, for example, 1 or 2 mols of a compound of the formula ll wherein R, and R have the meanings indicated under the formula 1, with l mol of manganese-(ll) carbonate or manganese-(ll) hydroxide.

Suitable solvents for these reactions are above all wa- 2, isolated as sodium salts, and 9.90 g (0.05 mol) of manganese-(ll) chloride tetrahydrate are dissolved in 400 ml of boiling ethanol. l-lereupon, sodium chloride precipitates and is filtered off. In the case of Example 3, the manganese salt of the half-ester also partially precipitates at the same time. Here, removal of the sodium chloride is dispensed with and the process is continued with the suspension. The filtrate or the resulting suspension is evaporated to dryness and the residue is extracted with the solvents mentioned in Column 3. The evaporatedextract is subsequently subjected to the further purification described in Column 4 and is thereafter dried for 8 hours at a temperature of 60C and a pressure of 11 mm Hg. Following thisinstruction, the manganese-(ll) salts mentioned in Column are obtained, the properties of which are described in C01- umns 9 to 10. 1

Table l Properties Example Starting Extract- Additional End product I Content The substance is Colour Melting No. product ant purification Mn (ll)- soluble in (h consistpoint operation Mn at the boil, c ency (C) at room temperature) Ethanol Solution in Bis-(O- 18.2 16.6 Water (0) Pale i methylene ethyl- Ethanol (c) pink 79-80 1 C l-1:, ONa chloride and ethyl- Ligroin (h) powder precipitation phosphonate) OC H with ether CH 0 Extraction Bis-(O- 17.4 15.3 Water (0) White 340 Chlorowith ethyl-iso- Ethanol (h) powder (Decom- 2 H- ONa form acetone propyl Toluene (h) position) i phosphonate) a z s O Chlorw Extraction Bis-(O-n- 13.2 I 1.2 Ethanol (c) Pale a form with butylcyclo- Chloroform (c) beige 250 3 ONa absolute hexyl- Toluene (h) powder (Decomethanol phosphonate) position) ter, alcohols, especially methanol, ethanol and isopropanol, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, dioxane, tetrahydrofurane, acetonitrile and mixtures of these solvents.

Since the manganese-(ll) ion is easily oxidised, the reactions are advantageously carried out in an inert gas atmosphere, which can consist, for example, of nitrogen.

Since the manufacturing processes described are equilibrium reactions, the compounds formed are often obtained as mixtures which in addition to the desired compounds of the formula 1 contain further compounds which are in equilibrium with these in the particular reaction medium.

Such mixtures obtained by the manufacturing processes described are also suitable for use as light stabi-. lisers for polyamides.

The invention is described in more detail in the examples which follow.

EXAMPLES 1 TO 3 (compare Table I) 0.1 mol of the phosphonic acid half-esters of Column EXAMPLES 4 TO 10 (compare Table II) 0.1 mol of the phosphonic acid half-esters of Column 2, isolated as sodium salts, are dissolved in the type and amount of solvent indicated in Column 3 and; a solution of 10.2 g (0.0515 mol) ofmanganese-(Il) chloride tetrahydrate in 50 ml of the same solvent is added dropwise at 25 to 30C. .The precipitate thereby produced is filtered off and eluted with the solvent mentioned until no further chloride ions are detectable in the filtrate. (Example 5 behaves'differently in this workingup stage. On adding the manganese salt, an emulsion precipitates 7 instead of a solid precipitate, and this .emulsion is extracted with ether. After drying this solu-' mentioned in Column Sar eobtained, the properties of which are described in Columns 6 to 10.

Table 11 1 3 4 5 6 7 8 9 10 Ex, Starting Solvent Additional End product Properties No product amount purification Mr (111)- Content The substance is Colour Melting m operation soluble in (11 consistpoint 1 Mn at the boil, oncy (C) at room tempera ture) Bis-(O- Dimethyllormam- Pale ethyl-nide (0) pink 4 C H P-ONa Water None octyl- 1 1.1 Chloroform (c) powder (70 ml) phosphon- OQH,

0 Extraction Bis-(O-n- 9.9 Chloroform (e) White 11 with ethanoutyl-Z- Ligroin (c) CH3 (CH2):; QH- O1 la Water 01 at room ethylmass 300 temperature hexyl- OCH ml) phosphon C 11,, ale) 0 lRecrystalll3-l5-(0- 10.2 9.2 Water (11) Pale ii lsation ethyl-n- Chloroform (h) pink 6 C l-l 11 (War Water from dodccyl- Ligroin (h) powder 76-77" (70 ml) ethanol phosphon- OC H ate) None Bis-(O-n- 6.65 Dimethylforma- White 9899 strength butylmide (h) powder 7 C H PONa ethanol octade- Ethanol (h) cyl (120 ml) phos- Ligroin (h) phonate) Bis(0n- 6.3 Dimethylforma- Rale 1 18120 strength None octademide (h) pink cyl- 8 ethanol phenyl- Toluene (c) powder phosphonate) Water Bis(0 10.9 Dimethylforma- Pale ZOO-204 150 ml) None ethylmide (11) pink 9 CH -l -Ol Ia benzylpowder \ff 1 pm? 4 phon (EC- H, ate) 8% Ethanol None Bis-(O- l 1.1 10.0 Dimethylforma- White 228229 10 x y k (470 ml) ethyl-amide (h) powder H i] 0 naphthyl p nose fi si? S M Or v ate) OC H EXAMPLE 1 1 onto highly delustred polyarnide-G granules 1 .8% of ppm of Mn, as Mn phosphonate from Example 1, 2, s, 8 or 9, are sprinkled dry onto dried polyamide-6 granules delustred with 1.8% of iO (anatase) and the sprinkle-coated mixture was spun by means of extruders into 20 den monofilaments which were subsequently stretched.

For the comparison formulation, the amount of Mn-lll acetate corresponding to 50 ppm of Mn was dis solved in water and this solution was uniformly dried TiO The dry sprinklecoated mixture was then also spun by means of extruclers to give 20 den monofilamerits which were stretched.

As a further comparison, 20 den monofilarnent silk delustred with 1.8% of TiO but free of Mn, were also manufactured.

These 7 silk formulations were exposed on a white cardboard background, free of tension, in the Xenotest 450, and the mechanical strengths were determined after 500, 1,000, 1,500 and 2,060 hours exposure time. For the data obtained, see Table 1111.

Table III residual tenacity after Additives hours (hrs.)

Exposure time 500 I000 I500 2000 1) without Mn 20% s) 50 ppm of Mn as Mn phosphonate from Example 1 90% 80% 70% 60% 3) 50 ppm ofMnasMn phosphonate from Example 2 85% 85% 70% 65% 4) 50 ppm of Mn as Mn phosphonate from Example 6 85% 75% 65% 55% 5) 50 ppm ofMn as Mn phosphonate from Example 8 85% 70% 60% 50% 6) 50 ppm of Mn as Mn phosphonate from Example 9 95% 85% 75% 65% 7) 50 ppm of Mn as Mn-ll acetate 80% 65% 40% We claim: 1. A composition containing a polyamide and a stabi lizing amount of a compound of the formula I 0 OR, I 11,-? A M,. (n

wherein R, is selected from the group consisting of alkyl with l to 18 carbon atoms, cyclohexyl, aryl with 6 to 10 carbon atoms which is unsubstituted or substituted by 1 or 2 methyl groups, and aralkyl with 7 to 11 carbon atoms;

A" is selected from the group consisting of an anion of an aliphatic carboxylic acid with l to 18 carbon atoms, an anion of an aromatic carboxylic acid with 7 to 11 carbon atoms, and the chloride, bromide, and iodide anion;

x is l or 2,

y is 0 or 1, with x+y being 2, and

R is alkyl with l to 18 carbon atoms.

2. A compositionof claim 1, wherein R, is selected 5 from the group consisting of alkyl with l to 18 carbon atoms, cyclohexyl, phenyl, benzyl and naphthylmethyl.

3. A composition of claim 1, wherein R, is selected from the group consisting of alkyl with l to 12 carbon atoms, phenyl and benzyl.

4. A composition of claim 1, wherein R, is selected from the group consisting of alkyl with 2 to 12 carbon atoms, phenyl and benzyl and R is alkyl with 2 to 18 carbon atoms.

5. A composition of claim 1 wherein R, is selected from the group consisting of alkyl with 3 to 12 carbon atoms and benzyl.

6. A composition of claim 1, wherein A is selected from the group consising of the anion of an aliphatic carboxylic acid with 2 to 8 carbon atoms, the anion of an aromatic carboxylic acid with 7 to 8 carbon atoms, the chloride, bromide and iodide anion and R is selected from the group consisting methyl, ethyl, propyl, butyl and octyl.

7. A composition of claim 1, wherein A is selected from the group consisting of the anion of acetic acid, the anion of stearic acid, the chloride anion, and the iodide anion, and R is selected from the group consisting of methyl, ethyl and butyl.

8. A composition of claim 1, wherein x is 2 and y is 0.

9. A process for stabilizing polyamides, wherein a stabilizing amount of a compound of the formula I 0 OR, 1 a 1 A wherein R, is selected from the group consisting of alkyl with l to 18 carbon atoms, cyclohexyl, aryl with 6 to 10 carbon atoms which is unsubstituted or substituted by l or 2 methyl groups, and aralkyl with 7 to ll carbon atoms;

A is selected from the group consisting of an anion of an aliphatic carboxylic acid with l to 18 carbon atoms, an anion of an aromatic carboxylic acid with 7 to 11 carbon atoms, and the chloride, bromide, and iodide anion;

x is l or 2,

y is 0 or 1, with x+y being 2, and

R is alkyl with l to l8 carbon atoms, is incorporated.

10. A process of claim 9, wherein R, is selected from the group consisting of alkyl with l to 18 carbon atoms, cyclohexyl, phenyl, benzyl and naphthylmethyl.

l l. A process of claim 9, wherein R, is selected from the group consisting of alkyl with 1 to 12 carbon atoms, phenyl and benzyl.

12. A process of claim 9, wherein R, is selected from the group consisting of alkyl with 2 to 12 carbon atoms, phenyl and benzyl and R is alkyl with 2 to 18 carbon atoms.

13. Aprocess of claim 9, wherein R, is selected from the group consisting of alkyl with 3 to 12 carbon atoms and benzyl.

14. A process of claim 9, wherein A is selected from the group consisting of the anion of an aliphatic carboxylic acid with 2 to 8 carbon atoms, the anion of an aromatic carboxylic acid with 7 to 8 carbon atoms, the chloride, bromide and iodide anion and R is selected from the group consisting of methyl, ethyl, propyl, butyl, and octyl.

15. A process of claim 9, wherein A is selected from the group consisting of the anion of acetic acid, the anion of stearic acid, the chloride anion, and the iodide anion, and R is selected from the group consisting of methyl, ethyl, and butyl.

16. A process of claim 9, wherein x is 2 and y is 0. 

1. A COMPOSITION CONTAINING A POLYAMIDE AND A STABILIZING AMOUNT OF A COMPOUND OF THE FORMULA 1
 2. A composition of claim 1, wherein R1 is selected from the group consisting of alkyl with 1 to 18 carbon atoms, cyclohexyl, phenyl, benzyl and naphthylmethyl.
 3. A composition of claim 1, wherein R1 is selected from the group consisting of alkyl with 1 to 12 carbon atoms, phenyl and benzyl.
 4. A composition of claim 1, wherein R1 is selected from the group consisting of alkyl with 2 to 12 carbon atoms, phenyl and benzyl and R2 is alkyl with 2 to 18 carbon atoms.
 5. A composition of claim 1 wherein R1 is selected from the group consisting of alkyl with 3 to 12 carbon atoms and benzyl.
 6. A composition of claim 1, wherein A is selected from the group consising of the anion of an aliphatic carboxylic acid with 2 to 8 carbon atoms, the anion of an aromatic carboxylic acid with 7 to 8 carbon atoms, the chloride, bromide and iodide anion and R2 is selected from the group consisting methyl, ethyl, propyl, butyl and octyl.
 7. A composition of claim 1, wherein A is selected from the group consisting of the anion of acetic acid, the anion of stearic acid, the chloride anion, and the iodide anion, and R2 is selected from the group consisting of methyl, ethyl and butyl.
 8. A composition of claim 1, wherein x is 2 and y is
 0. 9. A process for stabilizing polyamides, wherein a stabilizing amount of a compound of the formula I
 10. A process of claim 9, wherein R1 is selected from the group consisting of alkyl with 1 to 18 carbon atoms, cyclohexyl, phenyl, benzyl and naphthylmethyl.
 11. A process of claim 9, wherein R1 is selected from the group consisting of alkyl with 1 to 12 carbon atoms, phenyl and benzyl.
 12. A process of claim 9, wherein R1 is selected from the group consisting of alkyl with 2 to 12 carbon atoms, phenyl and benzyl and R2 is alkyl with 2 to 18 carbon atoms.
 13. A process of claim 9, wherein R1 is selected from the group consisting of alkyl with 3 to 12 carbon atoms and benzyl.
 14. A process of claim 9, wherein A is selected from the group consisting of the anion of an aliphatic carboxylic acid with 2 to 8 carbon atoms, the anion of an aromatic carboxylic acid with 7 to 8 carbon atoms, the chloride, bromide and iodide anion and R2 is selected from the group consisting of methyl, ethyl, propyl, butyl, and octyl.
 15. A process of claim 9, wherein A is selected from the group consisting of the anion of acetic acid, the anion of stearic acid, the chloride anion, and the iodide anion, and R2 is selected from the group consisting of methyl, ethyl, and butyl.
 16. A process of claim 9, wherein x is 2 and y is
 0. 